update changelog for release 4.2.5
update changelog for release 4.2.4
update changelog for release 4.1.20
update changelog for release 4.2.3
update changelog for release 4.1.19
update changelog for release 4.2.2
update changelog for release 4.1.18
update changelog for release 4.2.1
update changelog for release 4.2.0
update changelog for release 4.1.17